You might want to look at EcoFasten base plates fastened into the sheathing with eight fasteners per. Flashing around the pedestals is pretty easy on a TPO roof, but the boots require about 8" to properly flash. We've done this with the base plate on DensDeck, but the fasteners went through insulation and into a 24ga metal roof. I'm not sure how the pull out of OSB would change the calculations, but our spacing was 48 inches here with 160 mph design wind speeds in Zone 1.
Jason Szumlanski Fafco Solar On Mon, Nov 25, 2013 at 3:58 PM, Carl Adams <[email protected]> wrote: > Hello Wrenches, > > I am looking at a new construction project where the roof will be 5 degree > pitch, 5/8" OSB on top of TJI (truss joists). I am not sure the TJI will > support a lag attachment, as we would use with a conventional wood frame > trusses. > > Have any of you run into this, and if so what attachment method did you > use. > > I have attached tow pictures. One of a similar low slope roof which > appears to use Pro Solar rails and perhaps the Pro Solar Fast Jack > E-series. I'm not sure a single lag would work with the TJI. The other > attached picture is of the TJI. Looking at this amkes me think another > connection method might be a better choice. > > With Regards > Carl Adams NABCEP 031508-1 > SunRock Solar > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > >
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